Hi,

I am new to jna and I am trying to access an unmanaged C++ dll that I made on
Visual Studio 2008.

The header file for this dll is:

#pragma once

#include "stdafx.h"

#include "LumiAPI.h"

#include "LumiTypes.h"

# define EXPORT __declspec (dllexport)

// Struct que contém os dados das imagens capturadas pelo Lumidigm.

struct LumidigmImageData

{

uint imageWidth; // Largura da imagem

uint imageHeight; // Altura da imagem

uint imageBPP; // Bits per pixel da imagem

uint imageDPI; // DPI da imagem

};

LUMI_DEVICE_HANDLE deviceHandle;

LumidigmImageData imgData;

extern EXPORT int init();

extern EXPORT char* capturaImagem();

I mapped the init and capturaImagem methods into the following interface:

package br.com.itautec.centralbiometrica.nativeInterfaces;

import com.sun.jna.Native;

import com.sun.jna.win32.StdCallLibrary;

public interface Lumidigm extends StdCallLibrary

{

public Lumidigm INSTANCE = (Lumidigm) Native.loadLibrary("C:/Itautec/Central
Biometrica/Java/InnovatricsEngine/lib/Lumidigm/LumidigmHelper.dll",
Lumidigm.class);

int init();

String capturaImagem();

}

After that I've tried to call the library from my main method using:

Lumidigm lumi = Lumidigm.INSTANCE;

lumi.init();

The problem is that whenever I run this program I get the following error
message:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up
function 'capturaImagem': Não foi possível encontrar o procedimento
especificado.

at com.sun.jna.Function.<init>(Function.java:129)

at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:250)

at com.sun.jna.Library$Handler.invoke(Library.java:191)

at $Proxy0.capturaImagem(Unknown Source)

at br.com.itautec.innovatricsEngine.Program.main(Program.java:32)

Can anyone help me?

Thank you,

Felipe Armoni

Analista de Sistemas.

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